Note: This minicryptic was written on the occasion of the series finale
of Buffy the Vampire Slayer. While it does not contain spoilers
for the series finale, it does make reference to various events
of the preceding seven seasons, so those who are behind in their viewing
and are scrupulously avoiding spoilers should probably duck out now.

Class Protector

by Kevin Wald

This crossword contains a magic talisman to protect the three classes of
grid entries: (1) those that do not overlap it at all, (2) those that
overlap it in part, and (3) those that fall entirely within it. Read the
first letters of the clues for class 1, then the second letters of the
clues for class 2, and finally the third letters of the clues for
class 3, to get a famous tribute to the magical entity also described
in the title.

ACROSS

1. Still-beating heart, perhaps from St. Paul or Mobile (8)
6. The mummy Xander dated, or anyone like her in California (4)
7. Grabbing back what is held by insecure Potentials (4)
8. Demonic stake is in toolbox when Angel finishes (6)
12. Solo's right for Anya's first musical performance (5)
13. Two in Cordelia's circle talk about site near pyramidal tombs (5)
15. Shapechanging insect is most agreeable (6)
16. Herb for a Wise One (4)
17. Eldest of three winged imps is colorful? (4)
18. Say, Willow describing a small Sumerian city's riches (8)